i'm using zimbra with satisfaction from oss 3
i use firewall to protect my zimbra server so only apop and https port are public.
My users use pop services for the most part so I'm happy with 4.5.1 OSS.
i wonder if zimbra upgrade is usefull for securty reason or not?
of course i'll continue upgrade but i would like to know when is it critical and when not
Can you help me?